/* _compress returns the compressed size, -1 if bigger */
int jffs2_rubinmips_compress(unsigned char *data_in, unsigned char *cpage_out,
uint32_t *sourcelen, uint32_t *dstlen)
{
return rubin_do_compress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
}
int jffs2_dynrubin_compress(unsigned char *data_in, unsigned char *cpage_out,
uint32_t *sourcelen, uint32_t *dstlen)
{
int bits[8];
unsigned char histo[256];
int i;
int ret;
uint32_t mysrclen, mydstlen;
mysrclen = *sourcelen;
mydstlen = *dstlen - 8;
if (*dstlen <= 12)
return -1;
memset(histo, 0, 256);
for (i=0; i<mysrclen; i++) {
histo[data_in[i]]++;
}
memset(bits, 0, sizeof(int)*8);
for (i=0; i<256; i++) {
if (i&128)
bits[7] += histo[i];
if (i&64)
bits[6] += histo[i];
if (i&32)
bits[5] += histo[i];
if (i&16)
bits[4] += histo[i];
if (i&8)
bits[3] += histo[i];
if (i&4)
bits[2] += histo[i];
if (i&2)
bits[1] += histo[i];
if (i&1)
bits[0] += histo[i];
}
for (i=0; i<8; i++) {
bits[i] = (bits[i] * 256) / mysrclen;
if (!bits[i]) bits[i] = 1;
if (bits[i] > 255) bits[i] = 255;
cpage_out[i] = bits[i];
}
ret = rubin_do_compress(256, bits, data_in, cpage_out+8, &mysrclen, &mydstlen);
if (ret)
return ret;
/* Add back the 8 bytes we took for the probabilities */
mydstlen += 8;
if (mysrclen <= mydstlen) {
/* We compressed */
return -1;
}
*sourcelen = mysrclen;
*dstlen = mydstlen;
return 0;
}
/* _compress returns the compressed size, -1 if bigger */
int rubinmips_compress(unsigned char *data_in, unsigned char *cpage_out,
__u32 *sourcelen, __u32 *dstlen)
{
return rubin_do_compress(BIT_DIVIDER_MIPS, bits_mips, data_in, cpage_out, sourcelen, dstlen);
}
